The invention discloses a screen printer. The screen printer comprises a rack, wherein a rotating platform is arranged on the rack and is connected with a driving device arranged in the rack, and a clamp is arranged on the rotating platform; a screen plate bracket is fixed to the rack, and a screen frame used for mounting a silk screen is movably arranged on the screen plate bracket; a scraper leftward and rightward movement motor is arranged on the rack, and a scraper bracket is arranged on a transmission shaft of the scraper leftward and rightward movement motor; a sliding block is movably arranged on the back of the scraper bracket, a scraper rotating motor is fixed to the sliding block, and the scraper rotating motor is connected with a scraper rotating shaft through a connecting mechanism; the scraper rotating shaft movably penetrates through the scraper bracket, extends towards the screen frame and is positioned above the screen frame; and a scraper is arranged on the scraper rotating shaft. The screen printer is convenient and accurate in printing and high in production efficiency.